Methods and Application of Road Fugitive Dust Emission Factor Localization

Abstract

Size distribution and emission factors are the basic information used in emission characteristic studies and emission inventory establishment. The silt loadings of typical roads in the Tongzhou district of Beijing were sampled and tested. A particulate matter resuspension and measurement system and a particle size spectrometer were used to measure the size distribution and particle size multiplier of the fugitive road dust in this study. The localized PM2.5 emission factors for the fugitive road dust were obtained by experiment and investigation. The results showed that the ratio of the particles with sizes from 0 μm to 2.5 μm was similar for different road types; the ratio of PM2.5 to PM10 in the fugitive road dust was between 0.28 and 0.32. The particle size multiplier of PM2.5 was between 0.18-0.20 g·(km·vehicle)-1 for the different types of roads. The PM2.5 emission factors for highways, national roads, provincial roads, county roads, and township roads were 0.06, 0.14, 0.31, 0.30, and 0.39 g·(km·vehicle)-1, respectively. The silt loadings of different type roads showed great differences; thus, field sampling of the silt loading is necessary in the emission factor localization process.